Mixing machine



L. J. B. BLAKE MIXING MACHINE ,Feb. 25; 1930.

Filed Nov. 2, 1928 2 Sheets-Sheet a l/Vl/f/VTOR L .J, 5.5LAKE BY Z fl- ATTORNEY Feb. 25, 1930. L. J. B. BLAKE 1,748,276

MIXING MACHINE Filed Nov. 2, 1928 2 Sheets-Sheet 2 Fig. 3.

L/55LAKE A 77 OR/VEYS Patented Feb. 25, 1930 LIONEL JAMES BAKER BLAKE, or BISHOPS sroarronnnnennnn MIXING MACHINE Application filed November 2, 1928-, Serial N 0. 316,795, and in- Great Britain November 4, 1927.

This invention relates to mixing machines for concrete, tarmacadam, glass batch, chemical and other mixtures and has particular reference to the type of mixing machine dey scribed in the specification of my United States Patent No. 1,693,688 dated 4th December, 1928, in which the mixing blades, paddles or scoops are carried on a rotatable shaft within a stationary drum and means are provided for continuously rotating the shaft so that the blades, paddles or scoops are successively elevated and also means for feeding the material to be mixed into the drum, for raising and lowering said feeding means. and

for tilting the drum to discharge the mixed material.

' The object of thepresent improvements is to provide an improved method of carrying the aforesaid blades, paddles or scoops and 59 also incidentally to protect the ends of the drum from the detrimental effects of the friction of the agglomeration thereon.

With these objects in view according to' this invention the blades, paddles or scoops are carried by circular plates or discs secured to the drum shaft at both ends of the drum and adapted to rotate with the drum shaft against the ends. Suitable packing rings, that may be lubricated and are fitted to the ends of the drum, are interposed between the inner surfaces of the ends of the drum and the outer surfaces of the discs and means are provided for regulating the pressure of the packing rings against the discs. But in order that the nature of the present improvements may be clearly understood reference should now be made to the accompanying drawings in which the saidimprovements are shown applied to the mixing machine described in the specification of my United States Patent No. 1,693,688, dated 1th De- .cember, 1928, only the parts of the same that are necessary to illustrate this invention bein shown.

59 Figure 2 a longitudinal section.

@imilar reference characters relate to like Figure 3 is a detail fragmentary sectional View to a larger scale and Figure 1 a similar view of a modification in the construction. 1

Referring to the drawings a represents the casing of the cylindrical stationary mixing drum'an'd b the ends thereof supported on the shaft 0. At each'end of the drum are'the circular plates or discs cl that are secured at their centres bymeans of the rivets e to the flanges f of the bushings g rigidly fixed as for example by keys h on the shaft 0 so-that the discs d rotate with the shaft against the ends I) of the drum. Packing rings 2' of felt or other suitable material are interposed as shown between the inner surfaces of the ends I) and the outer surfaces of the discs d and are maintained in position by the spring rings A? whereby the pressure of the rings 2' against the discs (Z is automatically regulated.

The buckets or scoops Z are formed of the section shown in Figure 1, their forward edges m extending practically the entire length of the drum While their rear edges n are shorter and overhang, thebuckets being secured at their forward ends only by means of the bolts 0 to the discs d.

Secured to the forward edge m of each of the buckets or scoops Zis a Wearing strip 39 of hardened steel that is preferably provided with a serrated'edge g as shown and slotted holes 1 are formed in the'edges m for the fixing bolts so as to permit of the adjustment of the serrated edges 9 with respect to the drum casing a and so provide the minimum amount of clearance. a

It will be appreciated that with the construction described the rotatable discs cl not only carry the buckets or scoops Z but also protect the ends Z) of the drum from the frictional effects of the agglomeration.

In order to positively prevent the access of liquid material to the space between the rotatable discs (Z and the end plates 7; of the drum the plate (Z may be constructed as shown in Figure 4 wherein a lip or fillet cl on the inside face of the rotatable disc (1 forms a housing for the packing ring'z' which may be retained in position by the loose ring j which is pressed against the packing ring 2' by the spring 3'' the compression or strength of which may be adjusted by the set screws Z2 screwed into bosses b situated around the ends I; of the drum.

' The space d between the rotatable discs d and the inside of the end plate 6 may be filled in with saw dust or other suitable granulated material to prevent any accumulation of the agglomeration that might pass from the mixing drum into the said space.

What I claim is 1. In a mixing machine of the kind described the combination of a stationary drum, a rotatable shaft within said drum, discs fixed to the said shaft at both ends of the drum and a plurality of scoops secured to I said discs.

2. In a mixing machine of the kind described the combination of a stationary drum, comprising a casing and end plates, a rotatable shaft passing through and supporting said end plates, discs fixed to the said shaft, a pluralityof scoops secured to said discs and packing rings interposed between said end plates and said discs. I

3. In a mixing machine of the kind described the combination of a stationary drum comprising a casing and end plates, a rotatable shaft passing through and supporting said end plates, discs fixed to the said shaft,

a plurality of scoops secured to said discs,

packing rings interposed between said end plates and said discs, and means for regulating the pressure of said packing rings against said discs.

4, In a mixing machine of the kind described the combination of a stationary drum,

a rotatable shaft within said drum, discs fixed to the said shaft at both ends of the drum and a plurality of scoopssecured at their forward edges to said discs.

5. In a mixing machine of the kind described the combination of a stationary drum, a rotatable shaft Within said drum, discs fixed to the saidshaft at both ends of the drum, a plurality of scoops secured at their forward edges to said discs, wearing strips attached to said forward edges and means for adjusting said Wearing strips with respect to the drum casing.

In testimony whereof I affix my signature.

LIONEL JAMES BAKER BLAKE. 

